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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Per Share Operating Performance:      
Net asset value, beginning of year $ 17.24 $ 11.65 $ 7.74
Total income (loss) (8.56) 5.78 4.01
Total expenses (0.10) (0.19) (0.10)
Net increase (decrease) in net asset value (8.66) 5.59 3.91
Net asset value, end of year $ 8.58 $ 17.24 $ 11.65
Total Return (50.23%) 47.98% 50.52%
Ratios to Average Net Assets      
Total income (loss) (75.12%) 11.13% 28.53%
Management fees 0.75% 0.75% 0.75%
Total expenses excluding management fees 1.11% 0.61% 1.28%
Expense waived (0.96%) (0.46%) (1.13%)
Net expense excluding management fees 0.15% 0.15% 0.15%
Net income (loss) (76.02%) 10.23% 27.63%